Embedded constant pools.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 1958 matching lines @@
     // Take another spin if there are now unswept objects in new space
     // (there are currently no more unswept promoted objects).
   } while (new_space_front != new_space_.top());
 
   return new_space_front;
 }
 
 
 STATIC_ASSERT((FixedDoubleArray::kHeaderSize & kDoubleAlignmentMask) ==
               0);  // NOLINT
-STATIC_ASSERT((ConstantPoolArray::kFirstEntryOffset & kDoubleAlignmentMask) ==
-              0);  // NOLINT
-STATIC_ASSERT((ConstantPoolArray::kExtendedFirstOffset &
-               kDoubleAlignmentMask) == 0);  // NOLINT
 STATIC_ASSERT((FixedTypedArrayBase::kDataOffset & kDoubleAlignmentMask) ==
               0);  // NOLINT
 #ifdef V8_HOST_ARCH_32_BIT
 STATIC_ASSERT((HeapNumber::kValueOffset & kDoubleAlignmentMask) !=
               0);  // NOLINT
 #endif
 
 
 int Heap::GetMaximumFillToAlign(AllocationAlignment alignment) {
   switch (alignment) {
@@ skipping 613 matching lines @@
 #define ALLOCATE_PARTIAL_MAP(instance_type, size, field_name)                \
   {                                                                          \
     Map* map;                                                                \
     if (!AllocatePartialMap((instance_type), (size)).To(&map)) return false; \
     set_##field_name##_map(map);                                             \
   }
 
     ALLOCATE_PARTIAL_MAP(FIXED_ARRAY_TYPE, kVariableSizeSentinel, fixed_array);
     ALLOCATE_PARTIAL_MAP(ODDBALL_TYPE, Oddball::kSize, undefined);
     ALLOCATE_PARTIAL_MAP(ODDBALL_TYPE, Oddball::kSize, null);
-    ALLOCATE_PARTIAL_MAP(CONSTANT_POOL_ARRAY_TYPE, kVariableSizeSentinel,
-                         constant_pool_array);
 
 #undef ALLOCATE_PARTIAL_MAP
   }
 
   // Allocate the empty array.
   {
     AllocationResult allocation = AllocateEmptyFixedArray();
     if (!allocation.To(&obj)) return false;
   }
   set_empty_fixed_array(FixedArray::cast(obj));
@@ skipping 16 matching lines @@
   // Set preliminary exception sentinel value before actually initializing it.
   set_exception(null_value());
 
   // Allocate the empty descriptor array.
   {
     AllocationResult allocation = AllocateEmptyFixedArray();
     if (!allocation.To(&obj)) return false;
   }
   set_empty_descriptor_array(DescriptorArray::cast(obj));
 
-  // Allocate the constant pool array.
-  {
-    AllocationResult allocation = AllocateEmptyConstantPoolArray();
-    if (!allocation.To(&obj)) return false;
-  }
-  set_empty_constant_pool_array(ConstantPoolArray::cast(obj));
-
   // Fix the instance_descriptors for the existing maps.
   meta_map()->set_code_cache(empty_fixed_array());
   meta_map()->set_dependent_code(DependentCode::cast(empty_fixed_array()));
   meta_map()->set_raw_transitions(Smi::FromInt(0));
   meta_map()->set_instance_descriptors(empty_descriptor_array());
   if (FLAG_unbox_double_fields) {
     meta_map()->set_layout_descriptor(LayoutDescriptor::FastPointerLayout());
   }
 
   fixed_array_map()->set_code_cache(empty_fixed_array());
@@ skipping 16 matching lines @@
   }
 
   null_map()->set_code_cache(empty_fixed_array());
   null_map()->set_dependent_code(DependentCode::cast(empty_fixed_array()));
   null_map()->set_raw_transitions(Smi::FromInt(0));
   null_map()->set_instance_descriptors(empty_descriptor_array());
   if (FLAG_unbox_double_fields) {
     null_map()->set_layout_descriptor(LayoutDescriptor::FastPointerLayout());
   }
 
-  constant_pool_array_map()->set_code_cache(empty_fixed_array());
-  constant_pool_array_map()->set_dependent_code(
-      DependentCode::cast(empty_fixed_array()));
-  constant_pool_array_map()->set_raw_transitions(Smi::FromInt(0));
-  constant_pool_array_map()->set_instance_descriptors(empty_descriptor_array());
-  if (FLAG_unbox_double_fields) {
-    constant_pool_array_map()->set_layout_descriptor(
-        LayoutDescriptor::FastPointerLayout());
-  }
-
   // Fix prototype object for existing maps.
   meta_map()->set_prototype(null_value());
   meta_map()->set_constructor_or_backpointer(null_value());
 
   fixed_array_map()->set_prototype(null_value());
   fixed_array_map()->set_constructor_or_backpointer(null_value());
 
   undefined_map()->set_prototype(null_value());
   undefined_map()->set_constructor_or_backpointer(null_value());
 
   null_map()->set_prototype(null_value());
   null_map()->set_constructor_or_backpointer(null_value());
 
-  constant_pool_array_map()->set_prototype(null_value());
-  constant_pool_array_map()->set_constructor_or_backpointer(null_value());
-
   {  // Map allocation
 #define ALLOCATE_MAP(instance_type, size, field_name)               \
   {                                                                 \
     Map* map;                                                       \
     if (!AllocateMap((instance_type), size).To(&map)) return false; \
     set_##field_name##_map(map);                                    \
   }
 
 #define ALLOCATE_VARSIZE_MAP(instance_type, field_name) \
   ALLOCATE_MAP(instance_type, kVariableSizeSentinel, field_name)
@@ skipping 1050 matching lines @@
   DCHECK(isolate_->code_range() == NULL || !isolate_->code_range()->valid() ||
          isolate_->code_range()->contains(code->address()));
   code->set_gc_metadata(Smi::FromInt(0));
   code->set_ic_age(global_ic_age_);
   return code;
 }
 
 
 AllocationResult Heap::CopyCode(Code* code) {
   AllocationResult allocation;
-  HeapObject* new_constant_pool;
-  if (FLAG_enable_ool_constant_pool &&
-      code->constant_pool() != empty_constant_pool_array()) {
-    // Copy the constant pool, since edits to the copied code may modify
-    // the constant pool.
-    allocation = CopyConstantPoolArray(code->constant_pool());
-    if (!allocation.To(&new_constant_pool)) return allocation;
-  } else {
-    new_constant_pool = empty_constant_pool_array();
-  }
 
   HeapObject* result = NULL;
   // Allocate an object the same size as the code object.
   int obj_size = code->Size();
   allocation = AllocateRaw(obj_size, CODE_SPACE, CODE_SPACE);
   if (!allocation.To(&result)) return allocation;
 
   // Copy code object.
   Address old_addr = code->address();
   Address new_addr = result->address();
   CopyBlock(new_addr, old_addr, obj_size);
   Code* new_code = Code::cast(result);
 
-  // Update the constant pool.
-  new_code->set_constant_pool(new_constant_pool);
-
   // Relocate the copy.
   DCHECK(IsAligned(bit_cast<intptr_t>(new_code->address()), kCodeAlignment));
   DCHECK(isolate_->code_range() == NULL || !isolate_->code_range()->valid() ||
          isolate_->code_range()->contains(code->address()));
   new_code->Relocate(new_addr - old_addr);
   return new_code;
 }
 
 
 AllocationResult Heap::CopyCode(Code* code, Vector<byte> reloc_info) {
-  // Allocate ByteArray and ConstantPoolArray before the Code object, so that we
-  // do not risk leaving uninitialized Code object (and breaking the heap).
+  // Allocate ByteArray before the Code object, so that we do not risk
+  // leaving uninitialized Code object (and breaking the heap).
   ByteArray* reloc_info_array;
   {
     AllocationResult allocation =
         AllocateByteArray(reloc_info.length(), TENURED);
     if (!allocation.To(&reloc_info_array)) return allocation;
   }
-  HeapObject* new_constant_pool;
-  if (FLAG_enable_ool_constant_pool &&
-      code->constant_pool() != empty_constant_pool_array()) {
-    // Copy the constant pool, since edits to the copied code may modify
-    // the constant pool.
-    AllocationResult allocation = CopyConstantPoolArray(code->constant_pool());
-    if (!allocation.To(&new_constant_pool)) return allocation;
-  } else {
-    new_constant_pool = empty_constant_pool_array();
-  }
 
   int new_body_size = RoundUp(code->instruction_size(), kObjectAlignment);
 
   int new_obj_size = Code::SizeFor(new_body_size);
 
   Address old_addr = code->address();
 
   size_t relocation_offset =
       static_cast<size_t>(code->instruction_end() - old_addr);
 
   HeapObject* result;
   AllocationResult allocation =
       AllocateRaw(new_obj_size, CODE_SPACE, CODE_SPACE);
   if (!allocation.To(&result)) return allocation;
 
   // Copy code object.
   Address new_addr = result->address();
 
   // Copy header and instructions.
   CopyBytes(new_addr, old_addr, relocation_offset);
 
   Code* new_code = Code::cast(result);
   new_code->set_relocation_info(reloc_info_array);
 
-  // Update constant pool.
-  new_code->set_constant_pool(new_constant_pool);
-
   // Copy patched rinfo.
   CopyBytes(new_code->relocation_start(), reloc_info.start(),
             static_cast<size_t>(reloc_info.length()));
 
   // Relocate the copy.
   DCHECK(IsAligned(bit_cast<intptr_t>(new_code->address()), kCodeAlignment));
   DCHECK(isolate_->code_range() == NULL || !isolate_->code_range()->valid() ||
          isolate_->code_range()->contains(code->address()));
   new_code->Relocate(new_addr - old_addr);
 
@@ skipping 472 matching lines @@
     if (!allocation.To(&obj)) return allocation;
   }
   obj->set_map_no_write_barrier(map);
   CopyBlock(obj->address() + FixedDoubleArray::kLengthOffset,
             src->address() + FixedDoubleArray::kLengthOffset,
             FixedDoubleArray::SizeFor(len) - FixedDoubleArray::kLengthOffset);
   return obj;
 }
 
 
-AllocationResult Heap::CopyConstantPoolArrayWithMap(ConstantPoolArray* src,
-                                                    Map* map) {
-  HeapObject* obj;
-  if (src->is_extended_layout()) {
-    ConstantPoolArray::NumberOfEntries small(src,
-                                             ConstantPoolArray::SMALL_SECTION);
-    ConstantPoolArray::NumberOfEntries extended(
-        src, ConstantPoolArray::EXTENDED_SECTION);
-    AllocationResult allocation =
-        AllocateExtendedConstantPoolArray(small, extended);
-    if (!allocation.To(&obj)) return allocation;
-  } else {
-    ConstantPoolArray::NumberOfEntries small(src,
-                                             ConstantPoolArray::SMALL_SECTION);
-    AllocationResult allocation = AllocateConstantPoolArray(small);
-    if (!allocation.To(&obj)) return allocation;
-  }
-  obj->set_map_no_write_barrier(map);
-  CopyBlock(obj->address() + ConstantPoolArray::kFirstEntryOffset,
-            src->address() + ConstantPoolArray::kFirstEntryOffset,
-            src->size() - ConstantPoolArray::kFirstEntryOffset);
-  return obj;
-}
-
-
 AllocationResult Heap::AllocateRawFixedArray(int length,
                                              PretenureFlag pretenure) {
   if (length < 0 || length > FixedArray::kMaxLength) {
     v8::internal::Heap::FatalProcessOutOfMemory("invalid array length", true);
   }
   int size = FixedArray::SizeFor(length);
   AllocationSpace space = SelectSpace(size, pretenure);
 
   return AllocateRaw(size, space, OLD_SPACE);
 }
@@ skipping 68 matching lines @@
   {
     AllocationResult allocation =
         AllocateRaw(size, space, OLD_SPACE, kDoubleAligned);
     if (!allocation.To(&object)) return allocation;
   }
 
   return object;
 }
 
 
-AllocationResult Heap::AllocateConstantPoolArray(
-    const ConstantPoolArray::NumberOfEntries& small) {
-  CHECK(small.are_in_range(0, ConstantPoolArray::kMaxSmallEntriesPerType));
-  int size = ConstantPoolArray::SizeFor(small);
-  AllocationSpace space = SelectSpace(size, TENURED);
-
-  HeapObject* object = nullptr;
-  {
-    AllocationResult allocation =
-        AllocateRaw(size, space, OLD_SPACE, kDoubleAligned);
-    if (!allocation.To(&object)) return allocation;
-  }
-  object->set_map_no_write_barrier(constant_pool_array_map());
-
-  ConstantPoolArray* constant_pool = ConstantPoolArray::cast(object);
-  constant_pool->Init(small);
-  constant_pool->ClearPtrEntries(isolate());
-  return constant_pool;
-}
-
-
-AllocationResult Heap::AllocateExtendedConstantPoolArray(
-    const ConstantPoolArray::NumberOfEntries& small,
-    const ConstantPoolArray::NumberOfEntries& extended) {
-  CHECK(small.are_in_range(0, ConstantPoolArray::kMaxSmallEntriesPerType));
-  CHECK(extended.are_in_range(0, kMaxInt));
-  int size = ConstantPoolArray::SizeForExtended(small, extended);
-  AllocationSpace space = SelectSpace(size, TENURED);
-
-  HeapObject* object;
-  {
-    AllocationResult allocation =
-        AllocateRaw(size, space, OLD_SPACE, kDoubleAligned);
-    if (!allocation.To(&object)) return allocation;
-  }
-  object->set_map_no_write_barrier(constant_pool_array_map());
-
-  ConstantPoolArray* constant_pool = ConstantPoolArray::cast(object);
-  constant_pool->InitExtended(small, extended);
-  constant_pool->ClearPtrEntries(isolate());
-  return constant_pool;
-}
-
-
-AllocationResult Heap::AllocateEmptyConstantPoolArray() {
-  ConstantPoolArray::NumberOfEntries small(0, 0, 0, 0);
-  int size = ConstantPoolArray::SizeFor(small);
-  HeapObject* result = NULL;
-  {
-    AllocationResult allocation = AllocateRaw(size, OLD_SPACE, OLD_SPACE);
-    if (!allocation.To(&result)) return allocation;
-  }
-  result->set_map_no_write_barrier(constant_pool_array_map());
-  ConstantPoolArray::cast(result)->Init(small);
-  return result;
-}
-
-
 AllocationResult Heap::AllocateSymbol() {
   // Statically ensure that it is safe to allocate symbols in paged spaces.
   STATIC_ASSERT(Symbol::kSize <= Page::kMaxRegularHeapObjectSize);
 
   HeapObject* result = NULL;
   AllocationResult allocation =
       AllocateRaw(Symbol::kSize, OLD_SPACE, OLD_SPACE);
   if (!allocation.To(&result)) return allocation;
 
   result->set_map_no_write_barrier(symbol_map());
@@ skipping 2119 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8